PayPls MCP Server

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden. It discloses return values (balance in native unit and approximate USD value), which is useful behavioral context. However, it lacks details on permissions, rate limits, or error handling, leaving gaps for a tool that accesses financial data.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, well-structured sentence that efficiently conveys the tool's purpose and return values without unnecessary words. It is front-loaded with the main action and includes essential details concisely.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given no annotations and no output schema, the description provides good context for a read-only tool by explaining the return format. However, it could be more complete by addressing potential errors or limitations, such as what happens if the bucket_id is invalid or token is unsupported.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents both parameters (bucket_id and token) with descriptions and defaults. The description does not add any parameter-specific details beyond what the schema provides, meeting the baseline for high coverage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb ('Get') and resource ('balance of a wallet bucket'), specifying what the tool does. It distinguishes from siblings like wallet_list_buckets (lists buckets) and wallet_send_btc (sends funds) by focusing on balance retrieval.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage for checking balances but does not explicitly state when to use this tool versus alternatives like wallet_tx_status (for transaction details) or wallet_list_buckets (for bucket information). No exclusions or prerequisites are mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.